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Symbol reliability determination and symbol pre-selection based on reliability criteria

Inactive Publication Date: 2007-06-12
ENTROPIC COMM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this case the symbol error rates can become so large that the demodulation process is severely degraded, and consequently the decision-directed demodulation process becomes undesirable.

Method used

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  • Symbol reliability determination and symbol pre-selection based on reliability criteria
  • Symbol reliability determination and symbol pre-selection based on reliability criteria
  • Symbol reliability determination and symbol pre-selection based on reliability criteria

Examples

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Embodiment Construction

[0023]Throughout this description, embodiments and variations are described for the purpose of illustrating uses and implementations of the invention. The illustrative description should be understood as presenting examples of the invention, rather than as limiting the scope of the invention.

[0024]FIG. 1 shows a simple block diagram of an inventive receiver 100, including a symbol reliability device 104. Modulated channel symbol data 108 are received over a communications channel and demodulated by a demodulator 102. Demodulated data 110 comprise received symbols rk. A symbol reliability device 104 performs symbol reliability operations as described hereinbelow to output data 112. Data 112 may comprise any combination of the following: estimated symbols ŝk reliability weights Rk, received symbols rk, residual values zk. Data 112 are provided as input to a receiver module or device 106 as shown in FIG. 1. For example, data 112 can be provided to modules for tracking carrier signal ph...

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PUM

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Abstract

A method and apparatus for processing demodulated data comprising received symbol data is disclosed. A decoder is used to compute estimated symbols and corresponding reliability metrics. The reliability metrics are transformed into reliability weights. Optionally, residuals relating to the difference between the received symbol data and the estimated symbols are computed. Output data are generated comprising any combination of the following: estimated symbols, reliability weights, residuals, and received symbol data. The residuals may be weighted by the reliability metrics and used by demodulation or error compensation loops to instantaneously reduce or increase the bandwidth of these loops.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application is a Continuation-in-Part (CIP) of commonly-assigned U.S. application Ser. No.: 09 / 715,877, filed Nov. 17, 2000 now U.S. Pat. No. 6,795,512, entitled “SYSTEM FOR CARRIER PHASE TRACKING OF CODED SYMBOLS USING RELIABILITY METRICS FOR SYMBOL ESTIMATES”, hereby incorporated by reference herein for its teachings on symbol reliability and carrier phase tracking of coded symbols. This application claims the benefit of the priority filing date of U.S. application Ser. No.: 09 / 715,877 in accordance with 35 USC § 120. This application is also related to U.S. application Ser. No.: 09 / 729,652, filed Dec. 4, 2000, entitled “ITERATIVE CARRIER PHASE TRACKING SYSTEM”; and U.S. application Ser. No.: 09 / 738,896, filed Dec. 15, 2000, entitled “SYSTEM FOR CARRIER PHASE TRACKING OF MULTI-DIMENSIONAL CODED SYMBOLS”. Each of these applications is commonly owned by the assignee hereof, and each is hereby fully incorporated by reference herein as...

Claims

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Application Information

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IPC IPC(8): H03D1/00H04L27/06H04L1/00H04L25/02H04L25/03H04L25/06
CPCH04L1/0054H04L1/0055H04L25/067H04L25/025H04L2025/03598
Inventor EIDSON, DONALD BRIANMURALI, RAMASWAMYKRIEGER, ABRAHAMBERGGREN, MAGNUS H.
Owner ENTROPIC COMM INC
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